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PSR Standards

Quick reference for PHP coding style standards: PSR-1, PSR-2, and PSR-12.

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PSR-1: Basic Coding Standard

Accepted

Files MUST use only <?php and <?= tags.

<?php

echo 'Hello';

Files MUST use only UTF-8 without BOM for PHP code.

Files SHOULD either declare symbols OR cause side-effects, but not both.

<?php
// Good: only declarations
function foo() {}
class Bar {}

Namespaces and classes MUST follow PSR-4 autoloading.

namespace Vendor\Package;

class MyClass {}

Class constants MUST be declared in all upper case with underscore separators.

class Foo {
    const VERSION = '1.0';
    const DATE_APPROVED = '2012-06-01';
}

Property names should follow a consistent convention (camelCase recommended).

class Foo {
    public $camelCase;
}

Method names MUST be declared in camelCase.

class Foo {
    public function myMethod() {}
}